chore(deps-dev): bump yaml from 2.9.0 to 2.9.1

[dependabot]

Bumps yaml from 2.9.0 to 2.9.1.

Release notes

Sourced from yaml's releases.

v2.9.1

• Limit recursive merge aliases (#685, #713)
• Simplify line unfolding during quoted string parsing (#714)

Commits

• 1440ecd 2.9.1
• c699bc5 fix: Simplify line unfolding during quoted string parsing (#714)
• d11ce77 fix: Limit recursive merge aliases (#713)
• c5f49f4 chore: Update docs-slate
• See full diff in compare view

[greptile-apps]

PR author is in the excluded authors list.

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[unbraind]

@dependabot rebase

[unbraind]

Verified by hand (bot-authored PRs get no AI review here): only package manifests change, the lockfile resolves yaml@2.9.1 exactly as the title states, the branch is level with main (which now carries the 2026.9.21 certification and the canonical pm-ops merge driver), and both required test jobs are green on this head.